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*Single password on any sites = Unsafe

In order to help you to understanding more details, I provide the sample code of the application for explaining you more of the concept of SHA1 and MD5 encryption. I will reference to the sample of the code for show you that why you should not use a single password on every system that you have an account. First of all you must download my application source code from this post on below.

Furthermore, you may download the application that can do more than my demo, but it has no source code for study. The purpose of the application for using to reverse the result of encryption into the original plaintext by brute-force algorithm. You can download the application of Google Play on your android mobile device or download at the website here, then install and run it. The application name is “Ultra Md5/SHA1 Decrypter”